Late last night, the popular Skydeck "Ledge" at the Willis Tower in Chicago cracked, as four men sat on it posing for a picture.

Just picture it: You and your unassuming family happily sit inside of one of Chicago's best-known monuments. The city is beneath you — about 1,353 feet beneath you, separated only by a pane of glass — until the floor cracks.

Moments before the family walked out onto the Skydeck, they say they were reassured by staffers that the window flooring was unbreakable.

"I had my palms on the floor and I could feel it cracking," Alejandro Garibay, 23, told The Chicago Tribune. "Honestly, I was in shock, in disbelief. I was scared."

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Despite claims that "protective coating" was what they felt cracking, it at least sounds like "unbreakable" isn't the most precise term to use now. With this news in mind, here are the ten luckiest people on Instagram who have tested the limits of fate and physics on The Ledge.